Elastic-fluid turbine



Aug. 30,1927. I ,640,451

0. 'JUNGGREN ELASTIC FLUID TURBINE Filed maylsjlszs &

'5 Inventor:

Oscar" Junggren,

" His Attovneg.

Patented Aug. 30, 1927.

pairs!) STATES 1,640,451 PATENT OFFICE.

OSCAR JUNGGBEN, or SCHENECTADY, NEW YORK, ASSIGNOR To GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELASTIC-FLUID TURBINE.

Application filed May 15, 1926. Serial No. 109,419.

The present inventionrelates to elastic fluid turbines, and especially to rotor or wheel structures, and has for its object to provide an improved construction and arranger; nt for fastening the turbine buckets in position on the rotor or wheel.

For a consideration of what I be novel and my invention, attention is directed to the accompanying description and the claims appended thereto.

In the drawing, Fig. 1 is a sectional view of a portion of, a turbine having a rotor embodying my invention; Fig. 2 is a sectional view through the turbine bucket structure prior to its being fastened onto the rotor or wheel; F ig. 8 is a view on a larger scale than Fig. 1, showing the bucket-fastening arrangement in section; and Fig. 4t is a face view of a part of a bucket ring prior to its being fastened to the rotor or wheel.

According to the embodiment of the invention illustrated in the drawing, I provide a plurality of bucket sections, each comprising a number of buckets 5 carried by a base 6, there being a sufficient number of bucket sections to form a complete bucket ring. The bucket sections may be formed in any suitable manner. For example, I may construct a complete bucket ring in accordance l with the method disclosed and claimed in the patent to Steenstrup, 1,551,342, patented August 25, 1925. Or I may construct 1t 1n accordance with the method disclosed and claimed in the patent to Steenstrup, No.

1,366,605, patented January 25, 1921. In Fig. at is illustrated one complete bucket sec tion and the ends of two additional bucket sections. The ends of the complete bucket section are indicated at a and b. In this instance four bucket sections are required to form a complete ring.

The bucket base 6 is finished to provide a projecting tongue 7 on the one side, and to provide a recess 8, a radially inner shoulder 9 and a projecting tongue 10 on the other side. 11 indicates a bucket cover. In the present instance the wheels 12 are formed integral with the shaft 13, and the rim of each wheel is finished to provide on one side a beveled surface 14 and to provide on the other side a recess 15, a radially outer shoulder 16 and a flat surface 17 having an upwardly facing groove 18 therein Which provides a lip 19. The bucket base 6 is finished first as is shown in Fig. 2, tongues 7 and 10 extending axially; The bucket base is placed then on the rim of the rotor, shoulder being located in recess 15 and shoulder 16 being located in recess 8; This can be done by passing the bucket structure radially inward until the basestrikes surbelieve to face 17 and then movin it axially to bring the shoulder 9 under shoulder 16. Shoulders 9 and 16 thus are interlocked with each other, After the bucket base has been positioned on the rim of thewheel, tongue 7 is forced down into groove 18 to force shoulders 9 into firm engagement with shoulder 16 and tongue 10 is forced down into engagement with surface 1 1 to force shoulder 16 firmly into recess 8. Thus the bucket structure is attached firmly to the wheel rim, and is held against radial and axial displacement.

My invention has particular utility in connection with comparatively small rotors wherein the Wheels are formed integral with the shaft and wherein the wheels are compartively close together. is desirable that the means for fastening the buckets in place be capable of being positioned by radial movement rather than by axial movement as this enables the work to be performed readily from the periphery of the wheel. This desirable condition is fulfilled by the present construction in that, as will be clear from an inspection of Figs. 2 and 3, tongues 7 and 10, which form the fastened means for the bucket structure,

are both positioned by being forced radially inward. This work may be performed readily from outside the circumference of the wheels, the tongues being rolled down or driven down as found desirable.

While I prefer to form the buckets in groups comprising a number of buckets having a common base and to fasten them to the rotor in groups, my invention is not limited necessarily to this arrangement since, if desired, the buckets may be fastened on individually.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown is only illustrative and that the invention may be carried out by other means.

In such cases it What I claim as new and desire to secure by Letters Patent of the United States is:

1. lhe combination with a rotor member locks with the shoulder on the rotor, and two tongues which project from opposite sides of the base and extend axially and radially inward, the end of one of said tongues engaging in said upwardly-facing groove and the other tongue overlying the side of the rim.

2. A bucket fastening means for turbine structures wherein the rotor rim is provided with a shoulder with which a shoulder on the bucket structure engages, characterized by the fact that the. shoulders are locked in engagement by two tongues on the bucket structure which project axially from opposite sides of the bucket structure and are en gaged with the rim by being forced radially inward.

3. The combination with a rotor member provided with a groove which forms a fiat surface and an axially-projecting shoulder, said flatsurface having a lip at its edge, of a bucket structure having a base provided with a groove which forms a shoulder and two tongues which project from opposite sides of the base, said shoulders being in engagement with each other and said tongues being forced radially inward to bring one of them into engagement with said lip and the other into engagement with aside face of the rotor member.

4. The combination with a rotor member provided on one side with a groove which forms a flat surface and an axially-projecting shoulder, said fiat surface havinga lip at its edge, and provided on its other side with a beveled surface, of a bucket structure having a base provided with a groove Which forms a shoulder and two tongues, said shoulders being in engagement with each other, and'said tongues being forced radially inward, one into engagement with said lip and the other into engagement with said beveled surface.

In witness whereof, I have hereunto set my hand this 14th day of May, 1926.

OSCAR J UNGGREN. 

